Water-heater.



C. A. BACKSTROM.

WATER HEATER.

APPLICATION FILED JUNE 1. I9I6- Patented Nov. 13, 1917.

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Specification of Letters Patent. Patented NOV. 13, 1917.

Application filed lune 1, 1916. Serial No. 101m;

To all whom it may concern:

Be it known that 1, CHARLES A. BACK- sraoar, a citizen of the United States, residing at Grafton, in the county of fillegheny and State of Pennsylvania, have invented certain new and useful. Improvements in Water-Heaters, of which the fol lowing is a specification.

The invention relates to water heaters and particularly to the base and burner const-ruction. It has for its primary objects; the provision of an improved arrangement for taking care of the water of condensa tion which drips from the coils; and the provision of an improved arrangement for supplying air to the burners and promoting combustion. One embodiment of the invention is illustrated in the accompany ing drawings, wherein- Figure 1 is a vertical section through the base of an instantaneous water heater containing my invention, and Fig. 2 is a transverse section on the line 11-11 of Fig; 1.

Referring to the drawings, 1 is the shell of the heater provided with a base 2 and carrying the ordinary water coil 3. Sup porting the base and carried by the legs a is the base casting 5 which is cast integral with the burner ring 6, such burner ring being supplied with gas from a conduit not shown.

Located above the burner ring is the bottom plate 7, such bottom plate being conical in form with a perforation 8 at the. center and a ring of perforations 9 (Fig. 2) adjacent. the periphery of the plate for the reception of the burners. The slot or perforation 10 (Fig. 2) which extends inward from the edge of the bottom plate is for the purpose of receiving the pilot burner 11, not shown in elevation in Fig. 1. The outer edge 12 of the bottom plate is turned up, as indicated in Fig. 1, and rests upon lugs carried by the shell, but not shown.

Bunsen burners 13 of any desired type may be employed, the burner illustrated being provided with a cap 14: with inwardly directed discharge spouts or nozzles 15. The burners are provided at their lower ends with rings 16 fitting removably over the upstanding spuds 17 carried by the burner ring so that the burners may be easily removed or replaced by a vertical movement. The burners have their air in lets at 18 through the space between the rings 16 and the lower edge of the burner wall, this being the common type of con struction in burners of this type, as illustrated for instance, in my copending appli cation, Serial #101,064, filed June 1, 1916. As indicated in Figs. 1 and 2, the Bunsen tubes do not entirely fill the perforations through the bottom plate, the purpose of this arrangement being to provide for an upfiow of air. around the Bunsen tubes to keep them cool and supply secondary air to the burners. The drip pan 19 is preferably provided below the central opening 8 of the bottom plate.

The water of condensation from the coil 3 is received upon the bottom plate 7 which drains to the center and discharges into the drip pan 19, such drip pan being located be neath the base and readily accessible for removal and replacement. The locating of the burners with their lower inlet ends below the bottom plate 7 is advantageous since this arrangement gives a supply of pure air for combustion purposes such as is not the case where the burners are located entirely within the heater and above the bottom plate. The provision of the inlet spaces by reason of the size of the perforations 9 is also advantageous as this permits a supply of air for each burner and serves to promote the combustion of the mixed gas and air as it issues from the burner spouts. L'ach burner is in this manner provided with its proper supply of air from the out side of the heater and the circulation of this supply of air to the proper point for combustion is promoted by the upward draft through the heater which sucks the air up through the spaces around the burner tubes and past the front ends of the burner spouts. Other advantages incident to the construction will be readily apparent to those skilled in the art.

What I claim is:

1. In combination in a water heater, a base. a burner ring therein, a bottom plate for the base located above the ring and provided with a ring of perforations for the reception of burners, and Bunsen burners mounted on the ring and extending through the perforations in the bottom plate, the said burners being provided with air inlets below the bottom plate.

2. In combination in a water heater, a base, a burner ring therein, a conical bottom plate in. the base open at the center and located above the burner ring, Bunsen burners mounted on the ring and extending through the bottom plate and having their air inlets below the bottom plate, and a drip pan located beneath the central open portion of the bottom plate.

3. In combination in a water heater, a base, a. burner ring therein, a bottom plate for the base located above the ring and provided with a ring of perforations for the reception of burners, and Bunsen burners mounted on the ring and extending through the perforations in the bottom plate, the said burners being provided with air inlets below the bottom plate, and the edges of the perforations in the bottom plate being spaced away from the burners to permit a supply of air through the spaces.

4. In combination in a water heater, a base, a burner ring therein, a bottom plate inclined downward to the center, and lo- Gcpies 01 this patent may be obtained for five cents each, by addressing the cated above the burner ring and having an outlet adjacent the center, Bunsen burners mounted on the burner ring and extending through the bottom plate and having their air inlets below the bottom plate, and a drip pan positioned beneath the bottom plate to receive the drainage from the outlet from the bottom plate.

5. In combination in a water heater, a base, a burner ring therein, a bottom plate inclined downward to the center, and located above the burner ring and having an outlet adjacent the center, and Bunsen burners mounted on the burner ring, and extending through the bottom plate but with their sides spaced away therefrom to provide air inlet spaces, the air inlets to the interior of the burners being located below the bottom plate.

CHARLES A. BACKSTROM.

"Commissioner of Patents,

Washington, D. O. 

